/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import 'package:onmessage/onmessage.dart';

import '../handlers/abstract_message_handler.dart';
import '../parsers/messages_parser.dart';

/// A listener for JavaScript window messages.
class MessagesListener {
  final AbstractMessageHandler handler;

  MessagesListener({
    required this.handler,
  }) {
    OnMessage.instance.stream.listen(_onWindowMessage);
  }

  void _onWindowMessage(MessageEvent event) {
    final message = MessagesParser().tryParse(event.data);

    if (message == null) {
      return;
    }

    handler.handle(message);
  }
}
